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> the prof expected us to use […] and I had missed that lecture

You just gave me a wave of nostalgia. That’s how I survived all of my math and physics classes. If you develop an intuitive understanding of the material, you can derive things as needed from a few core principles you do remember. A bit sad when learning is the way to subvert an educational system, though.




That's how I passed quite a few math exams that I couldn't be bothered to study for.




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